Structure activity relationships of silica supported AuCu and AuCuPd alloy catalysts for the oxidation of CO

J. Chris Bauer, David R. Mullins, Yatsandra Oyola, Steven H. Overbury, Sheng Dai

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Supported AuCu and AuCuPd catalysts were synthesized through the diffusion of Pd and Cu into Au nanoparticle seeds. When supported on SiO2, the AuCuPd nanoparticles were found to be the most active for the oxidation of CO after being exposed to reductive pretreatment conditions as opposed to oxidative pretreatment conditions. In contrast, AuCu/SiO2 was found to be more active for CO oxidation after the alloy phase was segregated into a Au-CuO x heterostructure. In situ XRD and EXAFS were used to monitor the structural changes of AuCu and AuCuPd catalysts as they were subjected to different pretreatment conditions. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)926-935
Number of pages10
JournalCatalysis Letters
Volume143
Issue number9
DOIs
StatePublished - Sep 2013

Funding

Acknowledgments The research was sponsored by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy, under Contract No. DE-AC05-00OR22725 with Oak Ridge National Laboratory managed and operated by UT-Battelle, LLC. EXAFS experiments were conducted at the National Synchrotron Light Source, Brookhaven National Laboratory, supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886 with additional support through the Synchrotron Catalysis Consortium under grant DE-FG02-05ER15688. A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, U.S. Department of Energy.

Keywords

  • CO oxidation
  • EXAFS
  • Heterogeneous catalysis
  • Nanoparticles
  • XRD

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